Wide angle prime for Canon 5d

[Speed addicted]

When I had my 7d I used a Sigma 10-20 for wide angle shots (mainly landscape stuff).
Now I have the 5d mk3 and I'm using the 24-105 as a general lens, but I'm missing the really wide angle.

I think I'm looking for a prime as most of the shots with the Sigma were 10-12mm which would equate to around 16-18mm, it won't need to be particularly fast or have IS.

So what's good out there? Budget is around the £400 mark but is reasonably flexible.

[RobbieKB]

Well it's about £150 cheaper and if your £400 is flexible there might be better options, but if you're not bothered about a lens being manual then have a browse:

http://www.pistonheads.com/gassing/topic.asp?h=0&a...

[nellyleelephant]

Used 17-40 would be perfect if you would accept a zoom.....and a slight increase in budget....

http://www.mpbphotographic.co.uk/used-equipment/us...

[Speed addicted]

I was thinking prime simply because you tend to get more bang for your buck image quality wise, I'm not adverse to the zoom though.

I'd like to be able to use filters as I'm quite fond of the 10 stop and long exposures so the Samyang is out.

[S47]

I use an old manual Olympus OM Tokina17mm with a cheap OM-Eos adaptor on my FF bodies. Its a Tiny, superb lens and being so wide, focus is from 1 meter or so to infinity. You ought to be able to buy one used off ebay for £50 or so.

[Craikeybaby]

Another vote for the 17-40mm, it works well with the 5D.